Wash the potatoes removing any dirt and knobbly bits that look unappetising.
Peel the potatoes and slice into chips approximately ½ inch wide.
Place a deep sided pan on the hob and add the oil. There should be a minimum of 2 inches of oil but the pan should not be more than ½ full as that can be dangerous.
Turn on the heat and warm the oil to 140C. A thermometer would be useful but if not drop a small piece of bread into the oil. At 140C it should be crisp within 10 seconds.
Have a large baking tray to hand lined with paper towel to drain the chips.
Divide the chips into batches and cook for about 7 – 8 minutes per batch. At this temp, they should be part cooked but not coloured.
Keep stirring them to prevent sticking to the sides and/or base of the pan.
Remove from the pan and place on the tray to drain.
Once all of the chips have been cooked once, increase the temperature of the oil to 180C (small piece of bread will now take about 4 seconds to crisp).
Again, cook the chips in batches to prevent cooling the oil and the chips sticking together.
After about 3 – 4 minutes, they should be golden brown and crispy.
Remove from the pan and drain on clean paper towel.
Serve hot as a side dish or snack with a sauce or dip of your choice.